a-body Master Cylinder Dr. diff. Aluminum Master Cylinder $85 + shipping
15/16" bore master from Dr. diff. It was mounted once and bleed system but never ran , it is in new condition , I ended up going with the 1 1/32" bore master from Dr. diff. you will need to buy the adapter plate but it will mount just like original with the adapter plate . I bought for 72 duster power brakes , believe it fits many a-bodys you can check there site